Increase treemap font size  accessibility.

Instead of using pixel for the font size using rem allows users to
alter root font size and have this change reflected in the binary-page.
This is especially helpful for user with vision impairements.

Change-Id: I58345ed6c5b17942d15ee0be9642ee5113adf9ca
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/561316
Reviewed-by: Jorge Betancourt <jmbetancourt@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
diff --git a/codesize/modules/binary-page-sk/binary-page-sk.scss b/codesize/modules/binary-page-sk/binary-page-sk.scss
index 69bd9f9..ddf0816 100644
--- a/codesize/modules/binary-page-sk/binary-page-sk.scss
+++ b/codesize/modules/binary-page-sk/binary-page-sk.scss
@@ -16,4 +16,8 @@
     margin-top: 10px;
     flex: 1;
   }
+
+  #treemap svg text {
+    font-size: 1rem;
+  }
 }